PLC Abstract

 THIRD YEAR SEMINAR ON

PROGRAMMABLE  LOGIC CONTROLLERS (PLC)

PRESENTED BY:  SATYAM SRIVASTAVA EN - F, IIIRD YEAR  ROLL NO. 0802721076

PROGRAMMABLE LOGIC CONTROLLERS (PLC) A programmable logic controller (PLC) or programmable controller is a digital computer used for automation of electromechanical   processes, such as control of machinery on factory assembly lines, amusement rides, or lighting fixtures. NEMA defines a PROGRAMMABLE LOGIC CONTROLLER as: ³ A

digitally operating electronic apparatus which uses a  programmable memory for the internal storage of instructions by implementing specific functions such as logic sequencing, timing, counting, and arithmetic to control, through digital or analog  input/output modules, various types of machines or processes´.

PLCs are used in many industries and machines. Unlike general  purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed or  non-volatile memory. A PLC is an example of a hard  real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result. In automated system, PLC controller is usually the central part of a  process control system. To run more complex processes it is possible to connect more PLC controllers to a central computer. In my report I will discuss the aforesaid advantages and functioning of a PLC and also throw some light on its applications with suitable examples. PRESENTED BY: Satyam Srivastava rd EN-F, III Year Roll No.:0802721076